<!doctype html>
<html>

<head>
	<title>Line Chart</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
	<script src="../../../dist/Chart.min.js"></script>
	<script src="../../utils.js"></script>
	<style>
		canvas {
			-moz-user-select: none;
			-webkit-user-select: none;
			-ms-user-select: none;
		}
	</style>
</head>

<body>
	<div style="width:1000px">
		<p>This example demonstrates a time series scale by drawing a financial line chart using just the core library. For more specific functionality for financial charts, please see <a href="https://github.com/chartjs/chartjs-chart-financial">chartjs-chart-financial</a></p>
		<canvas id="chart1"></canvas>
	</div>
	<br>
	<br>
	Chart Type:
	<select id="type">
		<option value="line">Line</option>
		<option value="bar">Bar</option>
	</select>
	<select id="unit">
		<option value="second">Second</option>
		<option value="minute">Minute</option>
		<option value="hour">Hour</option>
		<option value="day" selected>Day</option>
		<option value="month">Month</option>
		<option value="year">Year</option>
	</select>
	<button id="update">update</button>
	<script>
		function generateData() {
			var unit = document.getElementById('unit').value;

			function unitLessThanDay() {
				return unit === 'second' || unit === 'minute' || unit === 'hour';
			}

			function beforeNineThirty(date) {
				return date.hour() < 9 || (date.hour() === 9 && date.minute() < 30);
			}

			// Returns true if outside 9:30am-4pm on a weekday
			function outsideMarketHours(date) {
				if (date.isoWeekday() > 5) {
					return true;
				}
				if (unitLessThanDay() && (beforeNineThirty(date) || date.hour() > 16)) {
					return true;
				}
				return false;
			}

			function randomNumber(min, max) {
				return Math.random() * (max - min) + min;
			}

			function randomBar(date, lastClose) {
				var open = randomNumber(lastClose * 0.95, lastClose * 1.05).toFixed(2);
				var close = randomNumber(open * 0.95, open * 1.05).toFixed(2);
				return {
					t: date.valueOf(),
					y: close
				};
			}

			var date = moment('Jan 01 1990', 'MMM DD YYYY');
			var now = moment();
			var data = [];
			var lessThanDay = unitLessThanDay();
			for (; data.length < 600 && date.isBefore(now); date = date.clone().add(1, unit).startOf(unit)) {
				if (outsideMarketHours(date)) {
					if (!lessThanDay || !beforeNineThirty(date)) {
						date = date.clone().add(date.isoWeekday() >= 5 ? 8 - date.isoWeekday() : 1, 'day');
					}
					if (lessThanDay) {
						date = date.hour(9).minute(30).second(0);
					}
				}
				data.push(randomBar(date, data.length > 0 ? data[data.length - 1].y : 30));
			}

			return data;
		}

		var ctx = document.getElementById('chart1').getContext('2d');
		ctx.canvas.width = 1000;
		ctx.canvas.height = 300;

		var color = Chart.helpers.color;
		var cfg = {
			data: {
				datasets: [{
					label: 'CHRT - Chart.js Corporation',
					backgroundColor: color(window.chartColors.red).alpha(0.5).rgbString(),
					borderColor: window.chartColors.red,
					data: generateData(),
					type: 'line',
					pointRadius: 0,
					fill: false,
					lineTension: 0,
					borderWidth: 2
				}]
			},
			options: {
				animation: {
					duration: 0
				},
				scales: {
					x: {
						type: 'time',
						distribution: 'series',
						offset: true,
						ticks: {
							major: {
								enabled: true,
								fontStyle: 'bold'
							},
							source: 'data',
							autoSkip: true,
							autoSkipPadding: 75,
							maxRotation: 0,
							sampleSize: 100
						},
						afterBuildTicks: function(scale) {
							var majorUnit = scale._majorUnit;
							var ticks = scale.ticks;
							var firstTick = ticks[0];
							var i, ilen, val, tick, currMajor, lastMajor;

							val = moment(ticks[0].value);
							if ((majorUnit === 'minute' && val.second() === 0)
									|| (majorUnit === 'hour' && val.minute() === 0)
									|| (majorUnit === 'day' && val.hour() === 9)
									|| (majorUnit === 'month' && val.date() <= 3 && val.isoWeekday() === 1)
									|| (majorUnit === 'year' && val.month() === 0)) {
								firstTick.major = true;
							} else {
								firstTick.major = false;
							}
							lastMajor = val.get(majorUnit);

							for (i = 1, ilen = ticks.length; i < ilen; i++) {
								tick = ticks[i];
								val = moment(tick.value);
								currMajor = val.get(majorUnit);
								tick.major = currMajor !== lastMajor;
								lastMajor = currMajor;
							}
						}
					},
					y: {
						type: 'linear',
						gridLines: {
							drawBorder: false
						},
						scaleLabel: {
							display: true,
							labelString: 'Closing price ($)'
						}
					}
				},
				tooltips: {
					intersect: false,
					mode: 'index',
					callbacks: {
						label: function(tooltipItem, myData) {
							var label = myData.datasets[tooltipItem.datasetIndex].label || '';
							if (label) {
								label += ': ';
							}
							label += parseFloat(tooltipItem.value).toFixed(2);
							return label;
						}
					}
				}
			}
		};

		var chart = new Chart(ctx, cfg);

		document.getElementById('update').addEventListener('click', function() {
			var type = document.getElementById('type').value;
			var dataset = chart.config.data.datasets[0];
			dataset.type = type;
			dataset.data = generateData();
			chart.update();
		});

	</script>
</body>

</html>
